A novel purification method of activated carbon-supported carbon nanotubes using a mixture of Ca(OH)(2) and KOH as the ablation agent

文献类型： 外文期刊

第一作者： Hu, Yongjie

作者： Hu, Yongjie;Zhang, Linlin;Guo, Qixun;Zheng, Zhifeng;Liu, Yunquan;Ye, Yueyuan;Li, Shuirong;Wang, Duo;Jia, Xingyong

作者机构：

期刊名称：RSC ADVANCES （ 影响因子：3.361； 五年影响因子：3.39 ）

ISSN：

年卷期： 2021 年 11 卷 2 期

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收录情况： SCI

摘要： Transition metals (Fe, Co, Ni) supported on activated carbons with different pore diameters (<2 nm, 10 nm, 50 nm) to synthesize carbon nanotubes (CNTS) are first investigated in this study. Through several characteristic analyses, Ni supported on 50 nm activated carbon is verified to be the most efficient catalyst among the samples for CNT growth. The optimum conditions for CNT growth are at a growth temperature of 750 degrees C with a reaction time of 45 min. Furthermore, a novel purification method for CNTs is proposed, in which KOH and Ca(OH)(2) powder are pre-mixed with the crude CNTs and CO2 and N-2 gas are introduced into this mixture. When KOH and Ca(OH)(2) powder are used at a ratio of 2 : 1 under the atmosphere of CO2 and N-2 at the temperature of 750 degrees C for 1 h, almost all of the amorphous carbon is ablated. Compared with KOH powder, the addition of Ca(OH)(2) not only advances the ablation effect, but reduces the damage to CNTs.

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